Departamento de Física
URI permanente desta comunidadehttps://repositorio.fei.edu.br/handle/FEI/785
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43 resultados
Resultados da Pesquisa
- The NUMEN project @ LNS: Status and perspectives(2019-09-03) CAPPUZZELLO, F.; AGODI, C.; ACOSTA, L.; AMADOR-VALENZUELA, P.; AUERBACH, N.; BAREA, J.; BELLONE, J. I.; BELMONT, D.; BIJKER, R.; BONANNO, D.; BORELLO-LEWIN, T.; BOZTOSUN, I.; BRANCHINA, V.; BRASOLI, S.; BRISCHETTO, G.; BRUNASSO, O.; BURRELLO, S.; CALABRESE, S.; CALABRETTA, L.; CALVO, D.; CAPIROSSI, V.; CARBONE, D.; CAVALLARO, M.; CHEN, R.; CIRALDO, I.; LOMELI, E. R. C.; COLONNA, M.; D'AGOSTINO, G.; DJAPO, H.; DE GERONIMO, G.; DELAUNAY, F.; DESHMUKN, N.; DE FARIA, P. N.; ESPEJEL, R.; FERRARESI, C.; FERREIRA, J. L.; FERRETTI, J.; FINOCCHIARO, P.; FIRAT, S.; FISICHELLA, M.; FLORES, A.; FOTI, A.; GALLO, G.; GARCIA-TECOCOATZI, H.; GONGORA, B.; HACISALIHOGLU, A.; HAZAR, S.; HUERTA, A.; KOTILA, J.; KUCUK, Y.; IAZZI, F.; LANZALONE, G.; LA VIA, F.; LAY, J. A.; LENSKE, H.; LINARES, R.; LONGHITANO, F.; LO PRESTI, D.; LUBIAN, J.; MA, J.; MARIN-LAMBARRI, D.; MARTINEZ, S.; MAS, J.; MEDINA, N. H.; MENDES, D. R.; MEREU, P.; MORALLES, M.; OLIVEIRA, J. R. B.; ORDONEZ, C.; PAKOU, A.; PANDOLA, L.; PETRASCU, H.; PIETRALLA, N.; PINNA, F.; REITO, S.; REZA, G.; RIES, P.; RIFUGGIATO, D.; RODRIGUES, M. R. D.; RUSSO, A. D.; RUSSO, G.; SANDOVAL, S.; SANTOPINTO, E.; Roberto Santos; SGOUROS, O.; Marcilei Aparecida Guazzelli; SOLAKCI, S. O.; SOULIOTIS, G.; SOUKERA, V.; SPATAFORA, A.; TORRESI, D.; TUDISCO, S.; VSEVOLODOVNA, R. I. M.; VARGAS, H.; VEGA, G.; WANG, J. S.; WERNER, V.; YANG, Y. Y.; YILDIRIN, A.; ZAGATTO, V. A. B.© 2019 Author(s).The NUMEN project aims at accessing experimentally driven information on Nuclear Matrix Elements (NME) involved in the half-life of the neutrinoless double beta decay (0υββ), by high-accuracy measurements of the cross sections of Heavy Ion (HI) induced Double Charge Exchange (DCE) reactions. Particular interest is given to the (18O,18Ne) and (20Ne,20O) reactions as tools for β+ β+ and β-β- decays, respectively. First evidence about the possibility to get quantitative information about NME from experiments is found for both kind of reactions. In the experiments, performed at INFN - Laboratory Nazionali del Sud (LNS) in Catania, the beams are accelerated by the Superconducting Cyclotron (CS) and the reaction products are detected by the MAGNEX magnetic spectrometer. The measured cross sections are challengingly low, limiting the present exploration to few selected isotopes of interest in the context of typically low-yield experimental runs. A major upgrade of the LNS facility is foreseen in order to significantly increase the experimental yield, thus making feasible a systematic study of all the cases of interest. Frontiers technologies are going to be developed, to this purpose, for the accelerator and the detection systems. In parallel, advanced theoretical models are developed aiming at extracting the nuclear structure information from the measured cross sections.
- The NUMEN project @ LNS: Status and perspectives(2019-09-03) CAPPUZZELLO, F.; AGODI, C.; ACOSTA, L.; ALTANA, C.; AMADOR-VALENZUELA, P.; AUERBACH, N.; BAREA, J.; BELLONE, J.; BIJKER, R.; BONANNO, D.; BORELLO-LEWIN, T.; BOZTOSUN, I.; BRANCHINA, V.; BRASOLIN, S.; BRISCHETTO, G.; BRUNASSO, O.; BURRELLO, S.; CALABRESE, S.; CALABRETTA, L.; CALVO, D.; CAPIROSSI, V.; CARBONE, D.; CAVALLARO, M.; GARCIA,L. E. C.; LOMELI, E. R. C.; CHEN, R.; CIRALDO, I.; COLONNA, M.; D'AGOSTINO, G.; DELAUNAY, F.; DESHMUKH, N.; DJAPO, H.; DE GERONIMO, G.; DE LOS RIOS, K.; FERRARESI, C.; FERREIRA, J. L.; FERRETTI, J.; FINOCCHIARO, P.; FIRAT, S.; FISICHELLA, M.; FOTI, A.; GALLO, G.; GARCIA-TECOCOATZI, H.; HACISALIHOGLU, A.; HUERTA-HERNANDEZ, A.; KOTILA, Z. J.; KUCUK, Y.; IAZZI, F.; LANZALONE, G.; LAY, J. A.; LA FAUCI, L.; LA VIA, F.; LENSKE, H.; LINARES, R.; LO PRESTI, D.; LUBIAN, J.; MA. J.; MARIN-LAMBARRI, D.; RUIZ, J. M.; MEDINA, N. H.; MENDES, D. R.; MEREU, P.; MORALLES, M.; NERI, L.; OLIVEIRA, J. R. B.; PAKOU, A.; PANDOLA, L.; PETRASCU, H.; PIETRALLA, N.; PINNA, F.; REITO, S.; RIES, P.; RODRIGUES, M. R. D.; RUSSO, A. D.; RUSSO, G.; SANTOPINTO, E.; Roberto Santos; SERBINA, L.; SGOUROS, O.; Marcilei Aparecida Guazzelli; SOLAKCL, S. O.; SOULIOTIS, G.; SOUKERAS, V.; SPATAFORA, A.; TORRESI, D.; TUDISCO, S.; HERNANDEZ, H. V.; VSEVOLODOVNA, R. I. M.; WANG, J. S.; WERNER, V.; YANG, Y. Y.; YILDIRIN, A.; ZAGATTO, V. A. B.© 2019 Author(s).The NUMEN project aims at accessing experimentally driven information on Nuclear Matrix Elements (NME) involved in the half-life of the neutrinoless double beta decay (0νββ), by high-accuracy measurements of Heavy Ion (HI) induced Double Charge Exchange (DCE) reaction cross sections. In particular, the (18O,18Ne) and (20Ne,20O) reactions are used as tools for β+β+ and β-β- decays, respectively. In the experiments, performed at INFN - Laboratory Nazionali del Sud (LNS) in Catania, the beams are accelerated by the Superconducting Cyclotron (CS) and the reaction ejectiles are detected the MAGNEX magnetic spectrometer. The measured cross sections are challengingly low (a few nb), being the total reaction cross section much larger (a few b), thus a high sensitivity and a large rejection capability are demanded to the experimental set-up. This limits the present exploration to few selected isotopes of interest in the context of typically low-yield experimental runs. A major upgrade of the LNS facility is foreseen in order to increase the experimental yield of at least two orders of magnitude, still keeping the high sensitivity of the present set-up, making it feasible a systematic study of all the cases of interest. Frontiers technologies are going to be developed, to this purpose, for the accelerator and the detection systems. In parallel, advanced theoretical models are being developed in order to extract the nuclear structure information from the measured cross sections.
Artigo de evento 3 Citação(ões) na Scopus Radiation effect mechanisms in electronic devices(2013-12-01) Marcilei Aparecida Guazzelli; Roberto Santos; LEITE, F.; CUNHA, F.; CIRNE, K. H.; MEDINA, N. H.; ADDED, N.; AGUIAR, V. A. P.© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.In this work, P- and N-MOSFETs (Metal Oxide Semiconductor Field Effect Transistor) were submitted to X-ray and ion beams. CD 4007, a commercial off-the-shelf integrated circuit composed of six transistors, three P-type and three N-type, in a single package, was used. The integrated circuits were exposed to 60 MeV 35Cl ion beams using the São Paulo 8UD Pelletron Accelerator and 10 keV X-ray radiation, using a Shimadzu XRD-7000 X-ray diffractometer. The total dose effects due to ionizing radiation in MOSFET were analyzed. The results indicate Vth depends on the absorbed dose and dose rate. The deviation of Vth is higher for P-MOS, while the change in slope is higher for N-MOS. TID (Total Ionizing Dose) caused by heavy ion does not seem to affect mobility. After heat treatment, the device establishes a different equilibrium state compared to that achieved at room temperature. The heat treatment worsens the P-type characteristics and improves the N-type.Artigo de evento 1 Citação(ões) na Scopus Titanium extraction from waste NORM(2013-12-01) PEREIRA, B. R.; Marcilei Aparecida Guazzelli; FONTANA, G.; Roberto Santos; RIZZUTTO, M. A.; MEDINA, N. H.© Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.The constantly growing of global agricultural production depends on the development of a whole production to be lasting and sustainable. The phosphoric acid production is directly related to the production of fertilizers, but its process of obtaining requires numerous steps and generates a lot of waste. There are several elements in some of these wastes that are very valuable and important for economy and for technological development. An example is a residue derived from a step of physical handling of the phosphate rock, containing about 30% of titanium in its composition. Titanium can be used in various applications, such as a component in high-tech metallic alloys, or, in the form of titanium dioxide, which is the form that presents the greatest value in industry. This study focus at the concentration of titanium oxide present in a residue from the phosphoric acid production, by attacking the material chemically and doing its characterization by analytical methods. This would contribute to the national titanium concentrated production increased and enhance the economic yield of the phosphoric acid production process, by transforming an unused waste in a high value product. The methodology for the concentration of titanium oxide was based in industrial extraction of titanium ores and consists of solubilizing the impurities present in the sample by means of chemical attack. It has been determined experimentally that at temperatures around 70°C, hydrochloric acid provides a better solubilization of impurities, without extracting titanium, and it is possible to obtain a residual solid phase with about 58.5% of titanium on it. The results were determined by using the Energy Dispersive X-Ray Fluorescence (EDXRF) technique. As the original sample is a Normal Occurring Radioactive Material (NORM), an analysis of Gamma Ray Spectroscopy and EDXRF were realized to determine how the radionuclides form the U and Th series were affected by the chemical treatment.- Evaluating the Reliability of Different Voting Schemes for Fault Tolerant Approximate Systems(2023-06-20) BALEN, T. R.; GONZALEZ, C. J.; OLIVEIRA, I. F. V.; DA ROSA JR. L. S.; SOARES, R. I.; SCHVITTZ, R. B.; ADDED, N.; MACCHIONE, E. L. A.; AGUIAR, V. A. P.; Marcilei Aparecida Guazzelli; MEDINA, N. H.; BUTZEN, P. F.© 2023, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.This work presents a study on the reliability of voters for approximate fault tolerant systems in the context of single event effects and electromagnetic interference. A first case study analyses different topologies of single-bit majority voters for logic circuits employing fault injection by simulation. In these simulations, an analysis is first performed to identify the critical diffusion areas of the physical implementation according to the voter input vector. Additionally, as a second case study, practical heavy ion experiments on different architectures of software-based approximate voters for mixed-signal applications are also presented, and the cross section of each voter is evaluated. The system comprising the voters was irradiated in two distinct experiments with an 16O ion beam, producing an effective LET at the active region of 5.5 MeV/mg/cm 2 . As a complementary study, a conducted electromagnetic interference injection was also performed, considering two distinct voting schemes. Results of the case-studies allow identifying the most tolerant voter architectures (among the studied ones) for approximate computing applications under single event effects and electromagnetic interference.
- A focus on selected perspectives of the NUMEN project(2022-11-09) CAVALLARO, M.; AGODI, C.; BELLONE, J. I.; BRASOLIN, S.; BRISCHETTO, G. A.; BUSSA, M. P.; CALABRESE, S.; CALVO, D.; CAMPAJOLA, L.; CAPIROSSI, V.; CAPPUZZELLO, F.; CARBONE, D.; CIRALDO, I.; COLONNA, M.; DE BENEDICTIS, C.; DE GREGORIO, G.; DELAUNAY, F.; DUMITRACHE, F.; FERRARESI, C.; FINOCCHIARO, P.; FISICHELLA, M.; GALLIAN, S.; GAMBACURTA, D.; GANDOLFO, E. M.; GARGANO, A.; GIOVANNINI, M.; IAZZI, F.; LANZALONE, G.; LAVAGNO, A.; MEREU, P.; NERI, L.; PANDOLA, L.; PANERO, R.; PERSIANI, R.; PINNA, F.; RUSSO, A. D.; RUSSO, G.; SANTOPINTO, E.; SARTIRANA, D.; SGOUROS, O.; SHAR,A, V. R.; SOUKERAS, V.; SPATAFORA, A.; TORRESI, D.; TUDISCO, S.; AVANZI, L. H.; CARDOZO, E. N.; CHINAGLIA, E. F.; COSTA, K. M.; FERREIRA, J. L.; LINARES, R.; LUBIAN, J.; MASUNAGA, S. H.; MEDINA, N. H.; MORALLES, M.; OLIVEIRA, J. R. B.; SANTARELLI, T. M.; Roberto Santos; Marcilei Aparecida Guazzelli; ZAGATTO, V. A. B.; KOULOURIS, S.; PAKOU, A.; SOULIOTIS, G.; ACOSTA, L.; AMADOR-VALENZUELA, P.; BIJKER, R.; CHAVEZ LOMELI, E. R.; GARCIA-TECOCOATZI, H.; HUERTA HERNANDEZ, A.; MARIN-LAMBARRI, D. J.; VARGA HERNANDEZ, H.; VILLAGRAN, R. G.; BOZTOSUN, I.; DAPO, H.; EKE, C.; FIRAT, S.; HACISALIHOGU, A.; KUCUK, Y.; SOLAKCI, S. O.; YILDIRIM, A.; AUERBACH, N.; BURRELLO, S.; LENSKE, H.; ISSAK, J.; PIETRALLA, N.; WERNER, V.; LAY, J. A.; PETRASCU, H.; FERRETTI, J.; KOTILA, J.; DONALDSON, L. M.; KHUMALO, T.; NEVELING. R.; PELLEGRI, L.© 2022 Institute of Physics Publishing. All rights reserved.The use of double charge exchange reactions is discussed in view of their application to extract information that may be helpful to determinate the nuclear matrix elements entering in the expression of neutrinoless double beta decay half-life. The strategy adopted in the experimental campaigns performed at INFN - Laboratori Nazionali del Sud and in the analysis methods within the NUMEN project is briefly described, emphasizing the advantages of the multi-channel approach to nuclear reaction data analysis. An overview on the research and development activities on the MAGNEX magnetic spectrometer is also given, with a focus on the chosen technological solutions for the focal plane detector which will guarantee the performances at high-rate conditions.
- Banana and its nutrients: the power of the heart(2022-11-09) PALMA, M. S.; CURADO, J. F.; RIZZUTTO, M.; MEDINA, N. H.; Marcilei Aparecida Guazzelli© 2022 Institute of Physics Publishing. All rights reserved.Macro and micronutrients are essential minerals for the development of living beings, and this separation is given in quantitative reason, that is, while macronutrients, such as potassium and calcium, are required in larger amounts, micronutrients such as iron and zinc, are required in small quantities. For humans, potassium (K) is an essential macronutrient. In the human body, potassium has the function of regulating osmotic pressure, transmitting nerve impulses and carrying out muscle contraction. Its existence is found in high concentration in bananas. The heart banana plant is a little-known part among the by-products generated by banana cultivation, and is commonly discarded in the soil in order to increase its organic content, due to its high content of minerals such as potassium, calcium and zinc. Thus, this research work aimed to explore the nutritional potential of unconventional parts of banana for human consumption, through Energy Dispersion X-Ray Fluorescence technique, with which it is possible to identify and quantify the main constituent elements. The species were studied Musa Acuminata 'Dwarf/Cavendish', Musa Acuminata x M. Balbisiana 'Apple/Manzano', Musa Ornata 'Ornamental' and Musa Acuminata 'Fig'. The quantity of potassium and of other elements such as Ca, Fe, Mn, Zn, and Rb in the banana heart samples were studied superior to the findings in the literature.
- Heavy-Ion-Induced Avalanche Multiplication in Low-Voltage Power VDMosfet(2021-09-13) ALBERTON. S. G.; MEDINA, N. H.; ADDED, N.; AGUIAR, V. A. P.; Marcilei Aparecida Guazzelli; Roberto Santos© 2021 IEEE.Lackner's theory for avalanche multiplication in semiconductor devices provides physical interpretation for the model parameters and obtaining them through experimental methods is necessary. In this work, the charge collection mechanisms of heavy-ion-induced avalanche multiplication in power MOSFETs are studied based on Lackner's impact ionization model. The heavy-ion-induced impact ionization coefficients were estimated by comparing collected charge values obtained from computational simulations and experimental measurements.
- Ingestion dose and elemental composition in coffee by x-ray fluorescence and gamma-ray spectrometry(2022-11-09) Marcilei Aparecida Guazzelli; CURADO. J. F.; LOUREIRO, K. P.; MEDINA, N. H.; RIZZUTTO, M. A.© 2022 Institute of Physics Publishing. All rights reserved.The study proposed in this paper aims to analyze macro and micronutrients in coffee powder samples from Brazil, Venezuela and Colombia, in two different stages of coffee preparation: before and after coffee filtering. In the analyzed samples, presence of K, Rb, Ca, Cl, S, Sr and Fe elements in coffee powder and coffee grounds using Energy Dispersive X-ray fluorescence (ED-XRF) was quantified. The presence of 40K and the radionuclides from the uranium and thorium series decays were verified using gamma-ray spectrometry analyses. With the results obtained using these two techniques, it was possible to estimate the ingestion index for natural radioisotopes. The results show that the annual dose due to coffee ingestion reaches 1.96(4) mSv, depending on the origin of the coffee and considering the annual coffee consumption in Brazil. Elemental Composition analysis of coffee grounds indicates that it can be reused as a product with a high concentration of nutrients.
- COTS Tolerant to Total Ionizing Dose (TID): AlGaN/GaNbased transistor 10 KeV X-ray Analysis(2022-11-09) BOAS, A. C.V.; ALBERTON, S. G.; DE MELO, M. A. A.; Roberto Santos; Renato Giacomini; MEDINA, N. H.; SEIXAS, L. E.; FINCO, S.; PALOMO, F. R.; Marcilei Aparecida Guazzelli© 2022 Institute of Physics Publishing. All rights reserved.Gallium nitride commercial transistors (GaN FET) are great candidates as power devices tolerant to the effects of Total ionizing dose (TID). Therefore, we have evaluated its robustness by analysing parameters in its characteristic parameters. Devices were exposed to a 10 keV X-ray source accumulating a total of 350 krad(Si). However, results indicate that the tested components are more tolerant to the effects of TID when in on-state mode rather than the off-mode, that is, when the device is working, which is good news for COTS applications in environments subject to the effects of ionizing radiation.